Rotary cement-burning kiln



Nov. 18, 1930. A. v. JENSEN 1,781,845

ROTARY CEMENT BURNING KILN Filed April 25, 192 2 Sheets-Sheet 1 7 Nov. 18, 1930. A. v. JENSEN 1,781,345

ROTARY CEMENT BURNING KILN Filed April 25 1928 2Sheets--'Sh ee'c 2 Patented Nov. 18, 1930- 'UNITED STATES PATENT FF AYXELVJJENSEN, oracorENnAGEN, DENMAR ,fikssIenoa'ror. n snrnrn & do, or New YORK, n.1, A CORPORATION or nnw Jnns Y; I v

no'rARY cEMr'Nr-BuanmefxILN' i Application filed April 25, 1928, Serial No. 272,631,, an d inG reat Britain-mu mies, 1927;

is usually flanged inwardlyin order toprevent the escape of slurry into the dustchamher. The area ofthe opening throughwhich the products of combustionescape must be substantial and the depth of the flange i v ,7 h V V v stack." ,Theextremeend ofthe kiln is closed by an end'plate'c except fora relatively small central opening through which 'the' slurry tube d is extended within theki-lnfor the limited accordingly. In the operation of -modern kilnsof high capacity it sometimes happens that the escape of slurry into the dust chamber is not entirely prevented and it is the object of the present invention to overcome this difiiculty. Inaccordance with the invention, therefore, the kiln is provided with an end wall which has a much smaller central opening than has been usual heretofore through which the slurry delivery pipe or chute may be extended Within the kiln.

-The opening in the end plate, although it may permit theescape of some of the products of combustion, isnot sufiiciently large to permit the free escape thereof and accordingly outlets for the escape of the products of combustion within the zone of the dust chamber are formed in the circumferential wall of the kiln and guards are provided to i prevent the escape ofsl'urry through such outlets.

The invention will be more fully explained hereinafter with reference tothe accompanying drawings in which it is illustrated and V in which:

Figure 1 is a view in sectional elevation on the plane indicated by the broken line 'BB of Figure 2, showing so much of a rotary kiln with the dust chamber and slurry tube as is necessary to enable the application of the invention thereto to be understood.

Figure 2 is a view in transverse section,

the plan 'l f sectionbeing indicated he broken line- C .C of Figure 5i.

Figure dis a view: in transverse section of l the kiln, the planejof section beingindicated by the broken line D-D of Figure 3.

V 1 15s Figure 5 1s adetail vlew-in sectlon on the plane indicatedby thebroken line El -E ct V Figured) V i v Inthe embodiment'of the invention shown Figures-1 and2 the upper or feeding end of-th-e kiln a is shown as vprojectedwithin 1 the dustchamber b but not through the same.

The dustchamber is connected as usual to the i delivery of slurry into the kiln. Thecentral opening 0 in the end v plate 0 maybe of such 7 the zone of the dust--ichjamber,'are formed outlets e, 6 through which the products of combustion find free escape into the dust v chamber. Each of such outlets e is provided with a guard'which prevents the. escape of slurry through the-outlet Preferably, in the construction shown in Figures; 1 and 2,

the products of combustion may pass into the theoutlets e,ear,e arranged in diametric pairs and are connectedby a tube 7" open at its ends and provided on the side toward the v 7 lower or discharge end of the kiln with an opening 7, between'its ends, through which 7 tube f and may escape therefrom through 1 the outlets 6 into the dustchamber b, The

tubes 7 of which there may be one or more, constitute a guard means to prevent the escape of slurry through the outlets 0 while perh mitting the free escape of the products of} combustion.

In the embodiment of the invention illustrated' in Figures 3, 4 and 5 the kiln a is shown as. extended within the dust chamber to the construction vided in its circumferential wall withoutlets e which may be arranged opposite each other as shown, but offset somewhat. In this instance a guard device or tube f is shown as provided for each outlet e land as having an opening f at the centers of the kiln for the escape of the products of combustion. In the embodiment of the invention shown in-Figures 1 and 2 each guard tube is shown as rectangular in cross 860 :1011, but in the embodiment of the invention'shown 1n Figures 3, 4 and 5 it is shown asso twisted withreference to the direction of rotation of the kiln as to promote the movementofthe slurry in the kiln toward the discharge end.

'It will be understood that various changes in details of construction and arrangement may be madeto suit different conditions of use and except as pointed outin the accompanying claims the invention is not limited shown and, described I claim as my invention:

1. The combination of a 'rotar'y cement burning kiln, a dust chamberabout the feed end of the kiln and a slurry chute, the kiln having an end plate with a central opening for the entrance of the slurry chute, and .havingin its circumferential wall in the zon'eo'f p w the dust chamber-an opening'fo'rthe escape of substantially all of the productsofcombustion', and a guard within the kiln to prevent the escape of slurry throughsuch-openingin the circumferential wall. 7

2. The combination of arotary' cement burning kiln, a dust chamber'about the feed end of the kiln and a'slu ri'y chute, the kiln having an end plate with a central opening for the entrance of'the'slurry chute, 'and'having in its circumferential wall in the Zone of i the dust chamber anopening for "the escape of substantially all ofthe products =of combustion, and a guard tube within the kiln communicating with suchopening in the circumferential Wall and having an opening in the center of the kiln forthe escape of the products of combustion into the dust chamber. 7 r Thisapplication signed this 10th day of April, A. D. 1928.

- AXEL v. JENSEN. 7 

